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United States Patent | 5,181,659 |
Ohe | January 26, 1993 |
A tube having holes formed at precise positions is obtained by preparing a tube in which a substantially black synthetic resin film portion and a synthetic resin film portion substantially having a color other than black are formed alternately in its circumferential direction and then by drilling the black synthetic resin film portion by a laser beam.
Inventors: | Ohe; Tatsuta (Yamaguchi, JP) |
Assignee: | Mitsui Petrochemical Industries, Ltd. (Tokyo, JP) |
Appl. No.: | 461292 |
Filed: | January 5, 1990 |
Jan 07, 1989[JP] | 1-1876 |
Current U.S. Class: | 239/556; 219/121.71 |
Intern'l Class: | B23K 026/00 |
Field of Search: | 83/54 219/121.64,121.68,121.70,121.71 239/566,567,547,556,548,557 |
3293652 | Dec., 1966 | Roshov | 219/121. |
4028525 | Jun., 1977 | Mominee et al. | 219/121. |
4181051 | Jan., 1980 | Drori | 239/547. |
4857696 | Aug., 1989 | Tueusch et al. | 219/121. |